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Cromemco System One

by billdeg - 11/30/2006
Total messages in this thread: 7
Last Post: [ CDOSGEN was the answer ] 04/09/2010
I have just started working on this computer. I received it partially unassembled. I am unsure whether it worked or not. Fun. Cromemco System One Pics First I downloaded a copy of the System One user's guide, and using that document set the dip switches and cable up the computer. I also removed the Cromemco TU ART card card because the stock System One does not come with it and I wanted to start from stock first. I have to read the manual to determine how it interacts with the rest of the "stock cards" Here are pics of the cards that come with the System One. Cromemco 16 KZ memory card Cromemco PRI card Cromemco Z80 "ZPU" processor card [ read more ]

NEC 6001a Fonts

by billdeg - 04/04/2010
Total messages in this thread: 1
I received the following inquiry: "..I'm a user of Japanese NEC PC-6001 (not PC-6001A) Do you have NEC PC-6001A? If you have it, can you test this program and report as screenshot for me? This screenshot is VDG Font. .." RAM 16KB 5 SCREEN1,1,1:CLS 10 FORI=32TO255:PRINT CHR$(I);:NEXT 20 FORI=32TO255:POKE &HC000+I-32,0:NEXT RAM 32KB 5 SCREEN1,1,1:CLS 10 FORI=32TO255:PRINT CHR$(I);:NEXT 20 FORI=32TO255:POKE &H8000+I-32,0:NEXT ---------------- I have the 16K version, this it the program that I ran, here are the results: ----------------
When the program runs this is the first set of characters that appear on the screen, but you have to be quick, they only stay visible for a second.
[ read more ]

BBC Interview about MITS Altair

by billdeg - 04/03/2010
Total messages in this thread: 1
I was interviewed on BBC last night on the subject of the Altair and it's historical importance. Here is essentially a transcript of the interview, but I assume they trimmed out things to fit whatever they were using it for. I do not have a copy of the audio, or know when it was broadcast. Q What's an Altair 8800 like? BD: The Altair was first sold in early 1975 and was extremely primitive for today's standards running at a minute fraction of the processor speed and memory. The computer itself was housed in a blue and grey metal box, about 50 centimeters deep by 18 centimeters tall (or 7 inches by 20 inches). The only way to interface with the Altair was through a series of toggle switches on the front which were used to enter machine language commands one at a time in octal or hexadecimal notation. There was no keyboard or video screen. In fact the only "display," i... [ read more ]

Decwriter II

by billdeg - 03/31/2010
Total messages in this thread: 1

A Digital Equipment Corporation Decwriter II Model LA36 upgraded to 1200 baud.Pictures
This printer works, tested, OK.... [ read more ]

Teletype Model ASR 33 with Phone Option

by billdeg - 03/31/2010
Total messages in this thread: 1

Teletype Model ASR 33 with Phone Option.Pictures
... [ read more ]

Misc computer photos

by billdeg - 03/31/2010
Total messages in this thread: 1

Recently I have been given a number of new sets of computer books and software related to varied 80's operating systems including OS/2, MS DOS, and CP/M, Novell, Banyan, MAC, Osborne and Kaypro; hardware docs; miscellaneous harware including disk drives (SSQD/DSDD), printers, modems, and SCSI hard disk drives. Pictures
... [ read more ]

Wangwriter Terminal

by billdeg - 03/31/2010
Total messages in this thread: 1

A Wangwriter Terminal. I no longer have the computer system. Pictures [ read more ]

Atari 800 XL

by billdeg - 03/31/2010
Total messages in this thread: 1

A boxed Atari 800XL Computer system with peripherals. Pictures
... [ read more ]

Dynabyte DB8/1

by billdeg - 03/31/2010
Total messages in this thread: 1
This is a restoration program for MARCH for a Dynabyte S-100 system, not to be confused with the Dynabook prototype laptop from Xerox.
The Dynabyte DB8/1 was an early 80's S-100 system that employed the IEEE 696 standard. Click image for larger view.
So far the system has been partially disassembled. The controller cards have been visually inspected (1800002-4A CPU, 64K dynamic RAM Dual Drive Controller). The card connectors have been cleaned, the entire chassis has been vacuumed clear of dust. <... [ read more ]

Kaypro II pad PLA?

by billdeg - 03/14/2010
Total messages in this thread: 1
Kaypro II Portable.
The computer powers on, but the drive does not spin, nor does the system respond to a warmboot. The picture you see here is actually a still shot of the screen flashing characters in a rotating pattern of gibberish. I *think* the PLA is bad, 81-149C. Once when pressing down the PLA the system almost completed a boot cycle. I tried a known-working Z80, but no change in outcome.
I have had this system for years, but I never took time to see why it does not boot. Finally this weekend I took it apart to find that the inside condition is pretty bad/dirty. Note the rusty port connectors. ... [ read more ]

Zenith minisPORT laptop

by billdeg - 03/03/2010
Total messages in this thread: 1
The Zenith minisPORT laptop computer c. 1990. This is the 2MB ZL-2 model. The ZL-1 came with 1MB. Click thumbnail for larger image.
The Zenith minisPORT is an otherwise standard 80c86 LCD display laptop which is best known because of its 2 inch disk drive.
The Fuji 2 inch LT-1 diskette had a formatted capacity of approximately chkdsk displays 812K. Zenith sold an optional 720K external 3.5 drive. The internal 2 inch drive is not only smaller but it has more capacity (800+ Kb) than the 3.5 drive!
[ read more ]

New 4Mg Static RAM S-100 board

by monahan_z - 02/23/2010
Total messages in this thread: 1
In our continuing efforts to build new S-100 boards, Andre and I have just completed a 4Mg Static RAM S-100 board. While this board will work with current 8 bit systems it is really for 16 bit systems (8086, 80286 and 80386 etc.) we currently have in the works. This is just a prototype. Will give more details over the next few weeks. You can follow progress here:- http://s100compu...d/4MG%20RAM%20Board.htm... [ read more ]

Plus/4 var. '84 Canadian Olympic Team.

by billdeg - 02/18/2010
Total messages in this thread: 1
Answer to Trivia Question: What was official Computer of the 1984 Canadian Winter Olympic Team?
Answer: The Commodore Plus 4
Commodore sold some Plus/4's with a variation of the logo, and I assume that there was a cool 1984 Canadian Winter Olympics box, too. See Comparison Pic of Plus 4 variant logo design for the "Official Computer of the 1984 Canadian Winter Olympic Team" promotion vs. the standard. more pictures ... [ read more ]

Lobo Apple II Disk Drive Clone

by billdeg - 02/16/2010
Total messages in this thread: 1
Very early Lobo Apple II 5 1/4" drive clone, with "Santa Barbara" logo. Click image for more pictures
... [ read more ]

Replacing toggle switch on Altair 8800a

by billdeg - 02/13/2010
Total messages in this thread: 1
The good news is that for about an hour or so I had a 100% functional Altair 8800a..
MITS Altair 8800a closeup of broken A0 toggle switch. It's stuck in the 1 / on position
.. but Dan and I broke the A0 toggle switch during testing. It was bent and it was probably vulnerable to break so it did not take much to snap off. The system still works, but I can't deposit any values into memory that end in a "0" using the toggle switches. If I want to examine what's in 0000h I have to flip all of the toggles up (FFFFh), press "examine", and then "examine next" to get to 0000h. The lack of a functioning A0 toggle does not prevent me from using the system from a terminal or teletype as long as I have a bootstrapping monitor installed. A temporary setback only. I decided to disassemble... [ read more ]
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